Split drum for traverse winding frames



March 27, 1956 HAEFEL, 2,739,761

SPLIT DRUM FOR TRAVERSE WINDING FRAMES Filed July 19, 1951 INVENTOR. JAKo'B HAEFELI.

ATTORNEK SPLIT DRUM FOR TRAVERSE WINDING FRAMES Jakob Haefeli, Uster, Switzerland, assignor to Actiengesellschaft Joh. Jacob Rieter & Cie., Winterthur, Switzerland, a corporation of Switzerland Application July 19, 1951, Serial No. 237,604 Claims priority, application Switzerland August 7, 1950 7 Claims. (Cl. 24-2-43) The present invention relates to an improved split drum construction, particularly for use in winders for fine yarns, especially yarns consisting of a plurality of endless synthetic filaments. The strands of filaments are usually treated with a binding substance before they are wound, to prevent separation of filaments by electrostatic effects.

Filaments treated with a binding substance before winding, tend to adhere to and to be wound on the guide rollers and drums causing breaking of the filaments and loss of material.

It is an object of the present invention to provide an improved construction of the guide rollers and more particularly of the split drum for traverse winding frames which overcomes the difficulties set forth in the paragraph next above. This is accomplished by providing spaced recesses in the surface of the drum so that there is no continuous drum surface to which a continuous length of yarn can adhere. The recesses may be produced by providing ridges or ribs on the surface of the drum or by making apertures, slots, and the like in the drum so that the drum has no continuous surface.

Further and other objects of the present invention will be hereinafter set forth in the accompanying specification and claims, and shown in the drawing which, by way of illustration, shows what I now consider to be the preferred embodiments of my invention.

In the drawing:

Fig. 1 is a diagram illustrating a system for the continuous treatment and winding of yarn on a traverse winding frame;

Fig. 2 is a side view of a split drum according to the invention with a part broken off and of a spool and drive roller therefor for winding yarn;

Fig. 3 is a cross-section of the split drum shown in Fig. 2;

Fig. 4 is a longitudinal sectional view of a modified split drum according to the invention;

Fig. 5 is a cross-section of the drum shown in Fig. 4.

Like parts are designated by like numerals in all figures of the drawing.

Referring more particularly to Fig. 1 of the drawing, numeral 1 designates a strand of endless synthetic filaments which extends around two rollers 2 and 3 which are partly immersed in containers 4 and 5, respectively, containing a liquid or pasty binding substance. The course of the strand or yarn treated with the substance is consecutively controlled by guide rollers 6 and 7 before the yarn enters the slit 8 of drum 9. As seen in Fig. 2, the slit extends in axial and circumferential direction back and forth in the shell of drum 9 for traverse winding of the yarn on spool 10. The latter is rotatably supported on a lever 12 by pins 11. In the position of the lever shown in Fig. l, the spool rests on and is rotated by a positively driven roller 13 which frictionally engages the spool.

When setting up the machine the yarn 1 is laid by hand over the guide rollers 6 and 7, which are rotated at the same speed. Lever 12 is in the position shown in ats Patent ice Fig. l and the spool 10 is driven by drive roller 13 at a circumferential speed corresponding to that of rollers 6 and 7. Thereupon the spool 10 is briefly disengaged from roller 13 and the yarn coming from roller 7 is laid on spool 10 to which it adheres, because of the paste it picked up in the containers 4 and 5. The operator immediately swings lever 12 back to effect drive of spool 10 by roller 13. These operations must be performed quickly to prevent winding of the yarn onto roller 7. When the spool is reengaged with roller 13, the yarn usually contacts the surface of drum 9 until it is laid by the operator into the auxiliary slit 15 in the shell of the drum, from which slit the yarn enters the guide slit 8. The circumferential speed of spool 10 and of the yarn 16 wound thereon is greater than that of the split drum 9 which causes friction between the yarn 1 and the drum 9, and adherence of the yarn on the drum and undesired tension of the yarn, if the drum has the conventional smooth surface. The circumferential speed of the guide rollers 6 and 7 corresponds to that of the spool 10, and, since this is greater than that of the split drum 9, the yarn 1 slackens between roller 7 and the drum and adheres to roller 7, assuring a position as indicated by the dotted line 1 in Fig. 1. If the yarn is looped completely around roller 7, it breaks between the roller '7 and the windings 16. Since the operating speed is great, such breakage occurs suddenly, and the operator has no time to prevent it by positioning the yarn correctly in the slit 8.

As seen in Figs. 2 and 3, the drum 9 according to the invention is provided with circumferentially spaced ribs 17 extending substantially parallel to the rotation axis of the drum and lifting the yarn 1 from the surface of the drum, preventing adherence thereto. The ribs 17 need not be parallel to the rotation axis of the drum; it is sutlicient if they are so positioned on the drum surface that they are transverse to the course of the yarn.

With a drum according to the invention, the yarn is much less braked than on a drum having a smooth sur face and is pulled easily by the spool 10 over the ribs 17. The speed of the yarn 1 is not reduced between roller 7 and drum 9, and winding of the yarn on the roller 7 is avoided.

Instead of providing ribs 17 on the surface of the drum shell, the latter may be provided with apertures o slots 18 which extend transversely to the course of the yarn, as shown in Figs. 4 and 5. The webs between the slots spacedly support the yarn and have the same desirable eifect as the ribs 17.

Apertures in the drum shell according to the modification shown in Figs. 4 and 5 may be used for blowing air centrifugally from the inside of the drum against the yarn, preventing sticking of the latter to the drum surface. Blades 20 may be provided inside the drum for producing a blower effect and drawing air through an ertures 21 in the end faces of the drum and expelling it through the apertures 18 in the drum shell.

While I believe the above described embodiments of my invention to be preferred embodiments, I wish it to be understood that I do not desire to be limited to the exact details of design and construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim:

1. A drum for traversing yarn on a yarn winding machine, comprising a rotatable shaft, a pair of generally cylindrical members of equal diameters mounted on said shaft in axially spaced relation, each member having a complementary yarn guiding edge surface portion, the edge surface portion of one member facing the edge surface portion of the other member to provide an endless slit in which the yarn is passed back and forth, each of said members including a plurality of longitudinal yarn supporting surface portions of uniform circumferential extension, said longitudinal surface portions being arranged at a radius from the rotation axis of said shaft which radius is substantially the same and at least as great as the radius of said members, said longitudinal surface portions being circumferentially spaced from one another, and extending from said edge surface portions substantially transversely to the course of the yarn.

2. A drum for reciprocating yarn on a yarn winding machine, comprising a rotatable shaft, a pair of cylindrical members of equal diameters mounted on said shaft in axially spaced relation, each member having a complementary yarn guiding edge portion, the edge portion of one member facing the edge portion of the other mem bar to provide an endless slitin which the yarn is passed back and forth, each of said members including a plurality of peripheral longitudinal yarn supporting surface portions of uniform circumferential extension, said peripheral surface portions being arranged at a radius from the rotation axis of said shaft which radius is substantially the same and at least as great as the radius of said members, said peripheral surface portions being circumferentially spaced from one another, and extending from said yarn guiding edge portions substantially parallel to said shaft.

3. A drum for traversing yarn on a yarn winding machine, comprising a rotatable shaft, 3. pair of generally cylindrical cup shaped members of equal diameters mounted on said shaft in axially spaced relation, each member having a complementary yarn guiding edge portion, the edge portion of one member facing the edge portion of the other member to provide an endless slit in which the yarn is passed back and forth, and a plurality of peripheral longitudinal yarn supporting surface portions of uniform circumferential extension integral with each of said members, said surface portions being arranged at a radius from the rotation axis of said shaft which radius is substantially equal to and at least as great as the radius of said members, said peripheral surface portions being circumferentially spaced from one another and extending from said edge portions substantially transversely to the course of the yarn, said members including relieved surface portions intermediate of and integral with the yarn supporting surface portions.

4. A drum for traversing yarn on a yarn winding machine, comprising a rotatable shaft, a pair of generally cylindrical cup shaped members of equal diameters mount ed on said shaft in axially spaced relation, each member having a complementary yarn guiding edge surface portion, the edge surface portion of one member facing the edge surface portion of the other member to provide an endless slit in which the yarn is passed back and forth, each of said members including a plurality of longitudinal yarn supporting surface portions of uniform circ'umferential extension, said longitudinal surface portions being arranged at a distance from the rotation axis of said shaft which is at least as great as the radius of said members, said longitudinal surface portions being circumferentially spaced from one another and extending from said edge surface portions substantially transversely to the course of the yarn, and an aperture in said members intermediate said yarn supporting surface portions.

5. A drum for traversing yarn on a yarn Winding. machine, comprising a rotatable shaft, a pair of generally cylindrical cup shaped members of equal diameters mounted on said shaft in axially spaced relation, each member having a substantially V-shaped yarn guiding edge surface, the edge surface of one member facing the edge surface of the other member to provide an endless slit in which the yarn is passed back and forth, each of said members having a plurality of longitudinal yarn supporting surface portions of uniform circumferential extension, said longitudinal surface portions being arranged at a radius from the rotation axis of said shaft which radius is at least equal to the radius of said members, said longitudinal surface portions being equidistantly circumferentially spaced from one another and extending from said guiding edge surfaces substantially at a right angle to the course of the yarn.

6. A drum for traversing yarn on a yarn winding machine, comprising a rotatable shaft, a pair of generally cylindrical cup shaped members of equal diameters mounted on said shaft in axially spaced relation, each member having a complementary yarn guiding edge surface, the edge surface of one member facing the edge surface of the other member to provide an endless slit in which the yarn is passed back and forth, each of said members having a plurality of peripheral longitudinal yarn supporting surface portions of uniform circumferential extension, said longitudinal surface portions being arranged at a radius from the rotation axis of said shaft which radius is substantially the same and at least as great as the radius of said members, said longitudinal surface portions being circnmferentially and equidistantly spaced from one another and extending from said guiding edge surfaces substantially transversely to the course of the yarn, and a recessed surface portion on each of said members intermediate of and integral with said longitudinal yarn supporting surface portions, said longitudinal surface portions being of small circumferential extent relatively to the circumferential extent of said recessed surface portions and forming ridges on the cylindrical surface of said members.

7. A drum for traversing yarn on a yarn winding machine, comprising a rotatable shaft, a pair of generally cylindrical shaped members of equal diameter mounted on said shaft in axially spaced relation, each member having a yarn guiding marginal surface portion, each of said marginal surface portions having an edge, the edge of one member facing the edge of the other member to provide an endless slit in which the yarn is passed back and forth, a plurality of longitudinal yarn supporting surface portions arranged on the cylindrical surfaces of said members and being equidistantly circumferentially spaced from one another, said longitudinal surface per-- References Cited in the file of this patent UNITED STATES PATENTS 648,160 Carlson Apr. 24, 1906 1,543,519 Reiners et al. June 23, 1925 2,145,935 Kinsella Feb. 7,, 1939 2,191,791 Hardy et al. Feb. 27, 1940 2,223,914 Karns Dec. 3, 1946 2,455,495 Jellum Dec. 7, I948 

